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I come in to see my lovely Stepson and he surprises me by asking if I will rate his dick for him. I think he must be feeling insecure, so I agree. It's my job as Stepmom to build his confidence after all. So I take his penis out and begin to examine it, telling him how wonderful it is, much bigger than all the other penises I've seen. Of course he begins to get a little aroused. He would like to see what I think of his dick when it's hard. I help him out, tugging away, starting to fell aroused myself. Of course for any dick rating to be complete I need to see it cum, and so I take out my tits and encourage him to cum to climax...